System and method for compensating for baseline wander

Abstract

An improved invention providing a solution to a problem endemic to conventional adaptive equalizer systems, a problem known as baseline wander. The invention brings the baseline back down when it has drifted up due to baseline wander. The invention brings the baseline back up when it has drifted down due to baseline wander. The end result is that the invention keeps the data centered about the common mode, thus helping to ensure that the data is equalized properly without distortion.

We claim: 
     
       1. A method for inspecting for baseline wander and compensating for baseline wander of a pulse, comprising the steps of: (a) after training mode has terminated, check the width of the pulse;   (b) if the width of the pulse is greater than a predetermined value, initiate baseline wander mode and begin compensating for baseline wander;   (c) freeze peak adjustment algorithm and equalization adjustment algorithm;   (d) if the peak voltage of the high pulse is less than the voltage of a HIGH PEAK control signal, shift the waveform towards HIGH PEAK control signal, away from the direction of the common mode;   (e) if the peak voltage of the high pulse crosses the voltage of a HIGH PEAK control signal, shift the waveform away from HIGH PEAK control signal, in the direction of the common mode;   (f) if the peak voltage of the low pulse is greater than the voltage of a LOW PEAK control signal, shift the waveform towards LOW PEAK control signal, away from the direction of the common mode; and   (g) if the peak voltage of the low pulse crosses the voltage of a LOW PEAK control signal, shift the waveform away from LOW PEAK control signal, in the direction of the common mode.   
     
     
       2. A method for inspecting for baseline wander and compensating for baseline wander, comprising the steps of: (a) after training mode has terminated, check the width of a pulse;   (b) if the width of the pulse is greater than a predetermined value, initiate baseline wander mode and begin compensating for baseline wander;   (c) freeze peak adjustment algorithm and equalization adjustment algorithm;   (d) if the peak voltage of the high pulse crosses the voltage of a HIGH PEAK control signal, shift the waveform away from HIGH PEAK control, in the direction of the common mode; and   (e) if the peak voltage of a low pulse crosses the voltage of the LOW PEAK control signal, shift the waveform away from LOW PEAK control signal, in the direction of the common mode.   
     
     
       3. A method for inspecting for baseline wander and compensating for baseline wander, comprising the steps of: (a) after training mode has terminated, check the width of a pulse;   (b) if the width of the pulse is greater than a predetermined value, initiate baseline wander mode and begin compensating for baseline wander;   (c) freeze peak adjustment algorithm and equalization adjustment algorithm;   (d) if the peak voltage of the high pulse is less than the voltage of a HIGH PEAK control signal, shift the waveform towards HIGH PEAK control signal, away from the direction of the common mode; and   (e) if the peak voltage of the low pulse is greater than the voltage of a LOW PEAK control signal, shift the waveform towards LOW PEAK control signal, away from the direction of the common mode.